MATLAB: Evaluate whether a condition is met

conditionif

Hi all, I have to evaluate whether a condition is met: this is the basic method:

if a1 < b1 < a2
     disp ('ok')
     else disp ('error')
end

If I had n "b" and n+1 "a" I should write n if or is there a way to simplify it? if so how? thank you very much

Best Answer

Assuming size(a) is [1,n+1] and size(b) is [1,n]

 if a(1:end-1)<b  &  b<a(2:end)

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MATLAB: How to make matlab read certain lines and do calculations only when a condition is true

clear  variables
% Test the loop with these values of t, v and z, it should work just fine
% for any data.
t = 1:10;
v = [ 3 4 5 7 3 2 8 2 1 6];
M = length(t);
z = [1 1 0 1 1 0 1 0 1 1];
A = [];
for k = 1:M
    if(z(k)== 1)
        a = v(k)/t(k);
        A = [A; k a];
   fprintf('A section (eg. 1 and 2) occurs after a number skip  :counter of 1s before a 0 = %12.8f, a = %12.8f\n', k, a);
    end
      continue
end
%disp(A);

MATLAB: How to generalise this

As per my comment to your question: numbered variables are always an indication that your design is wrong. You should never have variables a_1, a_2, ... Instead you should have just one a variable (a cell array, a matrix, whatever is appropriate) that you index, e.g. a(1), a(2), ... With that design the ndgrid assignment is trivial.

%demo data
x = [0 1]'; y = [1 0]'; 
m = 10; n = 7;
c = repelem({x, y}, [m, n]);  %creates {x, ... , x, y, ... , y}; % m Xs and n Ys
[c{:}] = ndgrid(c{:});        %ndgrid
c = reshape(cat(m+n+1, c{:}), [], m+n);  
a = c(:, 1:m);
b = c(:, m+1:end);

a(:, i) is your a_i, b(:, i) is your b_i.

Best Answer

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MATLAB: How to make matlab read certain lines and do calculations only when a condition is true

MATLAB: How to generalise this

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